双光路全光纤电流互感器的研究

为了使光纤电流互感器具有快速、准确地测量出电流值的能力,本文在分析法拉第电磁感应效应的偏振调制型全光纤电流互感器的基础上引入双光路检测法,将光纤中输出的线偏振光分成振动方向相互垂直、传播方向成一定夹角的两束光。经光信号转换器转换成电信号后系统对其进行放大、滤波处理后得到无噪正弦波信号,结合TMS320F28335测试平台对输出的两路信号进行同步采集、解调,通过运算求出法拉第旋转角,并拟合法拉第旋角与参考电流值得出两者关系式,最终使测量系统能够在高压环境下快速、准确地测量电流值。由此可见,本系统适用于高压环境下对大电流进行检测。

Research on dual optical path all-fiber current transformer

In order to make fiber current transformer to have the ability to measure the current quickly and accurately,we analyzed the polarization-modulated all-fiber current transformer based on Faraday electromagnetic induction effect.And a dual optical path detection method is introduced.Polarized light from the optical fiber is divided into two beams.One is perpendicular to the direction of vibration,the other is at a certain angle towards the spread direction of the wave.After converting optic signal into electric signal,the sine wave signal obtained via amplification and filtering process is noiseless.Combining with TMS320F28335 test platform two output signals are synchronously acquired and demodulated,then the Faraday rotation angle is determined by calculation.And the relationship between fitting Faraday rotary and the reference current value is obtained.Finally the measurement system can measure current value in the high-pressure environment quickly and accurately.It proves that the system is applicable to large current detection in the high-pressure environment.